Adding Tinymce Toolbar Button In WordPress 3.9 & Above WYSIWYG Editor
WordPress changed the rules regarding it's TinyMCE integration in the WYSIWYG html editor. With the WP 3.9 version you get the TinyMCE version 4 and the following advantages: New UI and UI API. New theme. Revamped events system/API. Better code quality, readability and build process. Lots of (inline) documentation. And generally many improvements everywhere However [...]